Fine Thread Brake Pressure Switch, 10mm x 1.0p
These universal switches allow rearset users to operate the rear brake light. This all-in-one unit replaces the banjo bolt that connects the rear master cylinder to the rear brake line. You simply replace the bolt with this assembly and splice the wires into your existing brake light switch. The pressure inside your brake system then activates the brake light.
All modern Aprilia, Ducati
Yamaha up to 2002,
Suzuki up to 02 (most) & 2003 only GSXR600/750